Retiring cam



May 8, 1928.

T. BRADY RETIRING CAM Filed April 1, 1927 Patented May 8, 1928.

are

PATET THOMAS BRADY, OF EAST ORANGE, NEW JERSEY, ASSIGNOR TO OTISELEVATOR COM- PANY, OF NEW YORK, N. Y., A CORPORATION OF NEW JERSEY.

RETIRING CAM.

Application filed April 1, 1927. Serial No. 180,162.

This invention relates to retiring cams and particularly to retiringcams for use in elevator system One feature of the invention is toprovide a retiring cam of the above character that occupies a minimum ofspace.

Another feature of the invention is the provision of a retiring cam ofthe above character that is of simple construction and easily-installedand operated.

Still another feature of the invention is to provide a retiring cam ofthe above character that is silent and positive in opera tion.

Other features and advantages will become apparent from thespecification, taken in connection with the accompanying drawingswherein one embodiment of the invention is illustrated.

In the drawings Figurel illustrates the retiring cam of this inventionapplied to an elevator car;

Figure 2 is a view, with parts broken away, taken along the line 22 ofFigure 1 and illustrates the retiring cam in its eX- tended position;and

Figure 3 is a View in side elevation of Figure 2.

- Referring to Figure 1, an elevator car 1 is positioned at a landing 9.A retiring cam motor is provided as an operating device for retiring thecam. This motor has an operating connection, shown as a chain 3,connected-to a retiring cam and extend ing from the shaft 4 of the motor2 downwardly over sheave 5. 'The retiring cam 6 is arranged to actuatea' roller 7 carried by a switch lever 8 of a switch 19. The switch lever8 is pivoted upon a support mounted in the hatchway..

According to the preferred arrangement, the retiring cam 6 comprises aplate 10 secured by screws 11 to the car 1. Plate 10 is provided nearits upper end with a vertically extending slot 12. A rivet 13 extendsthrough the slot 12 andthrough aligned apertures provided in the upperend of an angle bar 14 and in a swivel plate 15. The angle bar 14 andthe swivel plate 15 are free to pivot upon the rivet 13. The lower endof the angle bar 14 is connected by a hinge 16 to the upper end of avertically extending angle bar 17. The lower end of angle bar 17 isconnected by a hinge 18 to the upper end of an angle bar 20. The lowerend of angle bar 20 is pivotally mounted up on a rivet 21 that extendsthrough apertures provided in the angle bar 20 and in plate 10. Anglebars 14, 17 and 20 constitute the rail of the retiring cam 6.

The upper end of the swivel plate is connected by a swivel 24 to thechain 3. The lower end of the swivel plate 15 is connected to one end ofa tension spring 22. The other end of tension spring 22 isconnected to'aspring anchor that is socured to the plate 10.

The operation of the retiring cam is as follows:

Assume that the car is at a landing as illustrated in Figure 1 with theretiring cam motor 2 energized. The motor 2, acting through the chain 3,holds the retiring cam 6 in its retracted position against the tensionof spring 22. To cause the retiring cam to operate the switch 19 theretiring cam motor is deenergized, permitting the tension spring 22 tounwind the chain' 3 from the motor shaft 4. As the chain 3 unwinds fromthe motor shaft, the swivel plate 15 moves downwardly under the ac tionof spring 22. The rivet 13, sliding in the slot 12, moves along with theswivel plate 15 and causes the upper end of the angle bar 14 to movealso. The lower end of angle bar 14 is thus caused to move downwardlyand outwardly. This movement of the lower end of angle bar 14 causesangle bar 17 to move outwardly and strike the roller 7 of the switch 19.Angle bar 20 also swings outwardly, turning about the rivet 21.Continued movement of the parts results in the operation of the switch19. 1V hen the rivet 13 strikes the bottom of the slot 12, the movingparts of the retiring cam are brought to rest, the cam being 1n itsextended position as illustrated in Figure 3. To assure that angle bar17 is substantially vertical when the cam is extended the angular motionbetween angle bar 17 and angle bars 14 and 20 is limited. This isaccomplished by forming the ends of angle bars 14 and adjacent angle bar17 so that they abut the ends of this angle bar at and 26 when the camis extended. In the same manner the angle bar 17 isheld substantiallyverticalwhen the cam is retired by theabutting of this angle bar withthe other angle bars at the points 27 and 28.

To retire'tli'e 'cani', the motor 2 is again energized causing the chainto be wound upon the motor shaft 4. The motion of chain 3 causes theswivel plate 15 to move upwardly against the force-of spring 22; Themotion of swivel plate 15 is transmit-ted through the rivet 13 to theseveral parts of the (2111i railand causes these parts to move intothepositions illustrated in Figure 1. The moving parts of the retiring camare brought to rest by the rivet 1'3 striking the upper end oi the slot-:2;

It isit o be noted that the retiring cam is very compact and. occup'esbut little hatchway space, thereby permitting the clearance between thecar and hatchway to be reduced to a minimum.

The retiring. cam may be moved to its extended position by HIGZHLS oi? aweight instead of by means of the tension spring Thus, a weight may besubstituted for this spring or the parts of the cam rail may be designedso as to cause the extension of the cam by their own weight.

As many changes could be made in the above construction and manyapparently widely different embodiments of this invention couldbe madewithout departing from the scope thereof, it is intended that all mattercontained in the above description or shown in the accompanying drawingsshall be interpreted as illustrative and not in a limiting sense.

I'Vhat is claimed is- 1. In a retiring cam, a cam rail comprising, avertically. extending first portion, a secondportionhinged at one end tosaid ver tically extending portion, and a third portion hinged at oneend to the other end of the vertically extending portion, said portionsbeing consrncted and arranged to limit the angular movement of thesecond and thirdportions with respect to the first portion.

2. In a retiring cam; a support; a cam rail comprising, a. verticallyextending first portion, a second portion hinged at one end to saidvertically extei'iding portion and pivoted at its other end to saidsupport, and a third portion hinged at one end to the otherend of thevertically extending portion and slidably as well as pivotally connectedat its. other end to said support, said portions. being constructed andarranged to limitthe angular movement of the second and third portionswith respect to the first portion.

3. A retiring cam comprising, a plate, a

cam rail pivotally connected at one end to said plate and slidablyconnected at its other end to said plate, and means for biasing the camrail to its extended position, said cam rail being arranged to turnabout its-pivotal connection with the plate and to slide at its slidableconnection with the plate in moving from its extended to its retiredposition.

t. A retiring cam comprising, a plate, a

cam rail having a plurality of sections hinged together, a section ofsaid cam rail bei-n pivota-lly connected to said plate and a-not iersection ofsaid cam rail being slidably connected to said plate, andmeans, acting upon thesecond named section of said cam rail, tending tohold the cam rail. in its extended position said cam rail being arrangedso that the first named section turns about its pivotal connection withthe plate and said second named section slides at its connection withsaid plate during themovement of the cam rail from its extended to itsretired position. I

5. In a retiring cam; a plate; a cam rail comprising, a plurality oisectionshinged together, a section of said cam rail being pivotallyconnected to said plate and another section of said cam rail beingslidably con nected to said plate; and a tension spring connected at oneend to said plate and at its other end to said second named section. ofthe cam rail, said spring biasin said ca'm rail to its extendedposition, and resisting the motion of the cam rail to its retiredposition.

6. In a retiring cam; a plate, a rivetextending through an aperture insaid plate; another rivet extending through a slot in said plate; and acam rail, said cam rail comprising, a vertically extending portion andtwo portions hinged to said vertically extending portion, one of saidhinged portions being pivotally mounted on said first named rivet, andthe other of said hinged portions being pivotally mounted on said secondnamed rivet.

7. In a retiring cam; a plate, a rivet extending through an aperture insaid plate; another rivet extending through a slot in saidplate; and acam rail, said cam rail comprising, a vertically extendingportion andtwo portions hinged to said vertically extending portion, one of saidhinged portions being pivotally mounted on said first named rivet, andthe other of said hinged portions being pivotally mounted on said secondnamed rivet, said second named rivet being positioned at one end of theslot in said plate while the cam rail is in its extended. position andpositioned at the other end of said slot while the cam rail is in itsretired position. 7

8. In a retiring cam; a-plate; a rivet extending through an aperture insaid plate; another rivet extending through a slot in said plate; a camrail, said cam rail comprising, a vertically extending portion and twoportions hinged to said vertically extending portion, one of said hingedportions being pivotally mounted on said first named rivet, and theother of said hinged portions being pivotally mounted on said secondnamed rivet; and spring means tending to hold said second named rivet atone end of the slot in said plate, thereby holding said cam rail in itsextended position, said second named rivet being arranged to move to theother end of the slot during the movement of the cam rail from itsextended to its retired position. I

In testimony whereof I have signed my name to this specification.

THOMAS BRADY.

